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United States Patent |
5,052,333
|
Woudsma
|
October 1, 1991
|
Plug
Abstract
A plug of deformable material such as wood or plastic, for tightly sealing
a cylindrical recess provided in wood, in which recess a crushable ampule
with a wood attack combating agent can be accommodated, said ampule being
attachable in a cavity of said plug by means of spring lugs, said plug
being provided with a conical drive-in surface, and at least one
deformable sealing clamping means being provided on said plug; the plug,
at the end facing away from the drive-in end, containing a separate
clamping sealing means for engaging the inner circumference of the recess,
the outer radial dimensions of the sealing means and of the plug being
such that complete sealing is acquired and maintained without damaging the
wood after the plug has been driven into the recess, even in the event of
high pressure build up in said recess.
Inventors:
|
Woudsma; Jacob (Vogezenlaan 23, 5701 PX Venray, NL)
|
Appl. No.:
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261969 |
Filed:
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August 31, 1988 |
PCT Filed:
|
February 23, 1987
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PCT NO:
|
PCT/NL87/00005
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371 Date:
|
August 31, 1988
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102(e) Date:
|
August 31, 1988
|
PCT PUB.NO.:
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WO87/05251 |
PCT PUB. Date:
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September 11, 1987 |
Foreign Application Priority Data
Current U.S. Class: |
118/100; 118/200; 118/205; 118/215; 144/330; 156/94; 156/98 |
Intern'l Class: |
B05C 001/00 |
Field of Search: |
144/330
156/94,98
118/200,100,205,214,215
427/291
|
References Cited
U.S. Patent Documents
2570588 | Jun., 1951 | Nylund | 144/330.
|
3896627 | Jul., 1975 | Brown | 405/261.
|
4055051 | Oct., 1977 | Finney | 405/261.
|
4322183 | Mar., 1982 | Ciavatta | 405/261.
|
4516886 | May., 1985 | Wright | 405/261.
|
4518292 | May., 1985 | Calandria | 405/261.
|
4555206 | Nov., 1985 | Sweeney | 405/261.
|
4611954 | Sep., 1986 | Cassidy | 405/261.
|
4693652 | Sep., 1987 | Sweeney | 405/261.
|
Foreign Patent Documents |
0125728 | Nov., 1984 | EP.
| |
0139318 | May., 1985 | EP.
| |
8303997 | Nov., 1983 | WO.
| |
0019901 | Apr., 1900 | GB | 156/98.
|
Primary Examiner: Hoag; Willard E.
Attorney, Agent or Firm: Kaplan; Blum
Claims
I claim:
1. A plug formed of a deformable material such as wood, synthetic material
or the like, for clampingly sealing a recess in wood, having a first end
to be driven in the recess and a second outer end opposite thereto, the
plug comprising: a cavity for accommodating a crushable ampule or holder
with a wood preservative; and a plurality of separate, cooperating
clamping sealing means for engaging an inner wall of the recess, at least
two of the clamping sealing means positioned at the second outer end of
the plug, the clamping sealing means being mutually movable so that the
sealing means positioned closest to the wood seals flush with the wood
surface, and prior to driving the plug in the recess, an outer radial
dimension of at least one of the sealing means is greater than the
internal radial dimension of a corresponding accommodating portion of the
recess to such an extent that, after the plug has been driven into the
recess, no damage to the wood or leakage of the wood preservative occurs.
2. The plug of claim 1, wherein the clamping means are sawtooth-shaped and
have various outer diameters.
3. The plug of previously added claim 1, further including a plurality of
lugs for attaching the ampule in the plug, the lugs extending from the
inner wall of the cavity into the cavity in a longitudinal direction.
4. The plug of claim 1, wherein the first end of the plug is tapered, and
the taper with respect to a surface perpendicular to the central axis of
the plug is between about 90.degree. and 96.degree..
5. The plug of claim 1, wherein the difference between the outer diameter
of the plug and the inner diameter of the recess is 1 mm.
6. The plug of claim 1, wherein the inner wall of the recess at the open
end, includes a layer of primer or the like.
7. The plug of claim 1, wherein the outer diameter of the wooden plug is
equal to the outer diameter of the end of the cap-shaped sealing means
nearest the first end of the plug, and the cap-shaped sealing means having
an outer diameter at said end smaller than the outer diameter at an
opposite end of the cap-shaped sealing means.
8. The plug of claim 1 wherein the outer diameter of the sealing means is
equal to the inner diameter of an end of the cap-shaped sealing means
nearest the first end of the plug, the cap-shaped sealing means having an
outer center line at said end smaller than the outer center line at the
opposite end.
9. The plug of claim 1, wherein one of the separate cooperating clamping
sealing means has the shape of a cylindrical wooden disc for providing a
flat clamping end which seals the open end of the recess.
10. The plug of claims 1 or 9, wherein the plug is formed of wood and is
cylindrical and includes a circumferential groove for accommodating an
O-ring.
11. The plug of claim 9, wherein the disc is formed of multi ply wood.
12. The plug of claims 1 or 9, wherein the clamping means are
sawtooth-shaped and the plug further includes a guide edge between the
clamping means and the first end, an O-ring positioned in a
circumferential groove between the clamping means and the second end and a
cylindrical disc having a central cavity for accommodating a central pin
with a bevelled edge.
13. The plug of claim 12, wherein each of the sloping surfaces of the
sawtooth-shaped clamping means form an angle, smaller than or equal to
45.degree., with the horizontal.
14. The plug of claim 1, wherein one of the separate cooperating clamping
sealing means is a cylindrical clamping jacket that is positioned on the
outer circumference side of the plug.
15. The plug of claim 14, wherein the plug has a T-shaped axial section and
the clamping jacket includes a conical inner wall portion at the inner
circumference of the first end of the plug, the clamping jacket engaging
an O-ring positioned in a circumferential groove of the plug.
16. The plug of claim 14, wherein the plug includes a T-shaped axial
section, and the inner side of the clamping jacket is connected to an
O-ring positioned in a circumferential groove of the plug.
17. The plug of claim 14, wherein the clamping means includes a
substantially rectangular axial section, and the clamping jacket is
accommodated at the broadened portion of the section, the inner side of
the clamping jacket connected to an O-ring positioned in a circumferential
groove of the plug, both the clamping jacket and the plug extending under
the surface of the wood.
18. The plug of claim 14, wherein the cylindrical clamping jacket is
integrated in a cap-shaped, clamping sealing means that is pivotable onto
the first end of the plug, the first end including a bevel.
19. The plug of claim 18, wherein the clamping means are sawtooth-shaped
and the clamping means are positioned on the clamping jacket which is
tapered toward the first end of the plug.
20. The plug of claim 18, wherein the clamping means are sawtooth-shaped
and the clamping means are positioned on the cap-shaped sealing means, the
cap-shaped sealing means including a cylindrical collar including a bevel,
said sealing means tapered towards the first end of the plug, and the plug
further including an O-ring positioned in a circumferential groove.
21. The plug of claim 18, wherein the clamping means are sawtooth-shaped
and the clamping means are positioned near the first end of the plug and
are defined by guiding surfaces the plug including a bevel for
accommodating the pivotable cap-shaped sealing means.
22. The plug of claim 18, wherein the clamping jacket and the cap-shaped
sealing means are formed of a synthetic material and the synthetic matter
PVC.
23. The plug of claim 18, wherein the clamping jacket and the cap-shaped
sealing means are formed of ABS.
24. The plug of claim 18, wherein when the clamping means and the
cap-shaped sealing means are formed of synthetic material, the synthetic
material is reinforced with glass.
25. The method of applying a preservative to wood comprising:
driving a deformable plug into a recession in a piece of wood, said plug
having a first end to be driven into the recess and a second outer end
opposite thereto, the plug defining a cavity accommodating a crushable
ampule containing a wood preservative and having a plurality of separate
cooperating clamping and sealing means engaging a wall defining the
recess, at least two of the clamping and sealing means being positioned at
the second outer end of the plug, the clamping and sealing means being
mutually movable so that the sealing means positioned closest to the wood
seals flush with the wood surface and prior to driving the plug into the
recess, an outer radial dimension of at least one of the sealing means is
greater than the internal radial dimension of a corresponding
accommodating portion of the recess to such an extent that after the plug
has been driven into the recess no damage to the wood outer surface or
leakage of the wood preservative outside of the recess occurs; and
applying a coating material on a wood surface defining the recess before
driving the plug into the wood.
26. The method of claim 25, including crushing the ampule to release the
wood preservative within the recess.
Description
The invention has reference to a plug of deformable material such as wood
or plastic, for tightly sealing a cylindrical recess provided in wood, in
which recess a crushable ampule with a wood attack combating agent can be
accommodated, said ampule being attachable in a cavity of said plug by
means of spring lugs, said plug being provided with a conical drive-in
surface, and at least one deformable sealing clamping means being provided
on said plug.
Such a plug is generally known. In the known plug, which is usually
provided with an edge, the upper side of the plug will generally not be
perpendicular to the surface of the wood when the recess is being drilled
and will therefore not be flush with said surface. As a result extra
expenses will have to be incurred for smooth burnishing as a preliminary
operation before repainting. The eccentric location of the plug edge
brings about a sealing that is not quite so good. In consequence of this,
when applying liquid wood preservatives which are applied under pressure,
the wood preservative may escape along the plug and come into contact with
the paint, which may lead to discolouration, yellowing, soaking off or
peeling off of the paint. Application to damp wood, in particular, causes
the plug to become visible when the wood is drying. The sealing may not
suffice when the wood is affected even slightly. If the plug is not
hingeably connected to the ampule, the ampule may break too soon, before
sealing has taken place. The use of plugs with too large a diameter will
cause the wood, especially dry wood, to split. When using sawtooth-shaped
ribs or clamping means, of which the sloping surface forms an angle larger
than 45.degree. with the horizontal, the wood is deformed and damaged, as
a result of which this may serve as a guide-way for the wood preservative
liquid and leakage may occur.
It is the object of the invention to remove the above-described objections
and to that end the invention is characterized in that the plug, at the
end facing away from the drive-in end, contains a separate clamping
sealing means for engaging the inner circumference of the recess, the
outer radial dimensions of the sealing means and of the plug being such
that complete sealing is acquired and maintained without damaging the wood
after the plug has been driven-in into the recess, even in the event of
high pressure-build-up in said recess.
In several embodiments of the present device the plug can move as a kind of
hinge, by which the plug always flushes with the surface of the wood
without drilling, perpendicular to said wood surface, having to take
place. Two spring, sawtooth-shaped clamping means with different
diameters, of which the sloping surface forms an angle smaller than or
equal to 45.degree. with the horizontal, are applied, said spring clamping
means deforming when they are driven-in into the wood, as a result of
which warping of the plug is prevented. When applying a clamping jacket
good sealing is obtained before the ampulla is crushed and its contents
are released. The use of a clamping jacket with or without a cap, and
provided with a tapered drive-in surface, serves for a seal between the
transition of two recesses with different diameters. An O-ring, which is
arranged in a circumferential groove of the plug, is used for sealing in
hard types of wood and for wood weakened by attack. By slightly
countersinking the plug with ampule or an impregnated plug, the finishing
operation can take place by means of a round wooden disk that can follow
the surface of the wood, thus preventing the plugs from becoming visible.
The difference between the outer diameter of the plug and the inner
diameter of one of the drilled holes is 1 mm at the most. If this
difference in diameter should be larger than 1 mm, then cracks will appear
in the wood and premature glass-breakage will occur when driving-in takes
place. The same type of disk is applied to each type of wood, so that,
especially when using transparant paint, which causes the structure of the
wood to remain visible, an esthetic finish is the result. For the cap
laminated wood is preferably used. The plug may also be made of laminated
wood. The O-ring, mentioned above, is preferably located at the end of the
plug facing away from the drive-in end of said plug, because, after the
ampule has been crushed, the seal still has to move when driving-in has
taken place, in connection with the proper crushing of the glass ampule.
By applying the present invention a number of seals, placed one after the
other, are obtained in the direction of the surface of the wood, which
seals, when applying mutually different materials for plug and clamping
jacket with or without a cap, bring about a permanent complete seal and
maintain it without the wood around the recess being damaged. Such damage
(splits, chip formation in the wall of the recess) would result in leakage
of the wood attack combating agent.
It is finally remarked that the applied synthetic material may be
reinforced with glass in order to avoid stripping-up of the outer wall of
the clamping jacket. At the open end of the drilled hole the inner wall of
the drilled hole may be provided with a layer of primer or the like before
the plug is driven-in, through which a gas tight high pressure seal is
obtained, in particular. Furthermore, the outer diameter of the wooden
plug should be equal to the outer diameter of the drive-in end of a cap
which, at that end, has an outer diameter which is smaller than that of
the opposite end of the cap.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be elucidated further with the aid of the drawing.
FIGS. 1 through 6 and 8 through 9 each show half an axial section and a
semi-view of the various embodiments according to the invention.
FIG. 7 is an enlarged cross-sectional view of the plug of FIG. 6, taken
along line VII--VII.
A plug 1 according to FIG. 1 contains a plurality of sawtooth-shaped
clamping means 2 having various radial dimensions, a guiding edge 3 being
provided at one side of said clamping means and an O-ring 4 being provided
in a circumferential groove 5 at the other side. At the end facing away
from the drive-in end, the plug is provided with a central pin 6 which has
a bevelled edge 7 at its end. The pin 6 fits in a cavity 8 of a
cylindrical wooden disk 9 which, on account of the bevel, can pivot around
the pin 6 so that, when a drilled recess 10 in the wood is not
perpendicular to the surface of the wood, the disk is able to adjust
itself to a slight degree so that it is flush with the surface of the
wood. The plug is furthermore provided with a cavity 11 for accommodating
and attaching an ampulla by means of spring lugs 13 (FIG. 7).
FIG. 2 shows a plug which is made of wood and which contains a
circumferential groove 5 for accommodating an O-ring 4. A sealing means
15, forms the end sealing, of which structure, colour and the like are
adapted to that of the surface of the wood.
In FIG. 3 the plug 1 also has a T-shaped axial section. In the broadened
portion 12 a clamping jacket 16 is provided which has a tapered inner wall
portion 17 at the inner circumference of its drive-in end in order to form
a space that is filled with wood when the clamping jacket is driven-in,
after which the plug 1 is driven-in. The clamping jacket engages an O-ring
accommodated in a circumferential groove 5.
FIG. 4 shows a plug that is provided with a cap 18 and a clamping jacket 19
forming part of said cap, on which clamping jacket a plurality of
sawtooth-shaped clamping means 2 are provided. The clamping jacket 19 is
provided with a tapered drive-in end 20 and is located in the broadened
portion 12 of the recess 10. The plug has a bevel at the end for
accommodating the cap, so that the cap can tilt with respect to the plug.
In the plug 1 of FIG. 5 a sawtooth-shaped clamping means 2 is provided on
the clamping jacket 21 of the cap 18, as well as an adjacent bevelled
cylindrical collar 22. The clamping jacket 21 is provided with a drive-in
end 23. On the drive-in end of the plug a circumferential groove 24 is
provided in which an O-ring is located. At the accommodating end of the
cap the plug has a bevel for hingeably accommodating the cap 18.
Plug 1 of FIG. 6 is similar to plug 1 of FIG. 5 except at the drive-in end
the plug 1 of FIG. 6 contains a plurality of sawtooth-shaped clamping
means 2, limited by guiding surfaces 32 and 33.
At the drive-in end the plug 1 of FIG. 6 contains a plurality of
sawtooth-shaped clamping means 2, limited by guiding surfaces 32 and 33.
The plug, at its accommodating end for the hingeable cap 18, has a bevel.
The plug 1 according to FIG. 8 has a T-shaped axial section, the clamping
jacket 26 being accommodated in a broadened portion 37 of the recess 10.
The inner side of the clamping jacket engages an O-ring 28 provided in a
circumferential groove of the plug.
The plug 1 illustrated in FIG. 9 has a substantially rectangular axial
section, the clamping jacket 30 being accommodated in the broadened
portion 29 of the recess 10, the inner side of said clamping jacket
engaging an O-ring 31 provided in a circumferential groove of the plug,
both the clamping jacket and the plug extending until below the surface of
the wood. The space above the plug is filled with a sealing material to
the surface of the wood.
It is preferable to provide resilient lugs (13) as shown in FIG. 7 said
lugs extending from the inner wall of the cavity for attachment of the
ampule (not shown) into said cavity and in its longitudinal direction.
The sloping surfaces on the sawtooth-shaped clamping means form an angle,
which is smaller than or equal to 45.degree., with the horizontal.
The taper of the drive-in end of a clamping means, for instance as shown in
FIG. 4, no. 20, lies between 90.degree.-96.degree. with respect to a
surface perpendicular to the central axis of the plug. As synthetic
material for the clamping jacket and the cap PVC or ABS is used. These
materials are well-suited for repainting and they swell when they come
into contact with organic and inorganic liquids.
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